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aSection on Cytology and Genetics, Department of Physiology, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
1
This investigation was supported in part by research grants PHS No. C-3010 and PHS No. C-2189 from the National Institutes of Health, Public Health Service; by grant no. 129 from the National Multiple Sclerosis Society; and by a research grant from Eli Lilly and Company.